US Bridges

County Road 1 over Coal Creek

Fair

Boulder County, Colorado · 300 Ft N of Bixler Blvd · Structure no. ERI001.0-010.0A

Built
1996
29 years old
Condition
Fair
inspected February 2024
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
5,198
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Road 1 over Coal Creek is a concrete frame carrying County Road 1 over Coal Creek in Boulder County, Colorado. It was built in 1996, so it is 29 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,198 vehicles a day, roughly 15% of them trucks, projected to reach 7,381 by 2042. The structure is 24 ft (7.4 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 1
CrossesCoal Creek
Location300 Ft N of Bixler Blvd
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.06328, -105.05542
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.4 m)
Longest span22 ft (6.8 m)
Deck width35 ft (10.8 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,198 (2023)
Projected traffic7,381 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 1 over Coal Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is County Road 1 over Coal Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does County Road 1 over Coal Creek carry?

About 5,198 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is County Road 1 over Coal Creek?

The structure is 24 ft (7.4 m) long with a longest span of 22 ft (6.8 m) and a deck 35 ft wide.

Who owns County Road 1 over Coal Creek?

It is owned by the Town or Township Highway Agency.